(19)

(11)

EP 1 547 311 A2

(12)

(88) Date of publication A3: 01.07.2004 (43) Date of publication: 29.06.2005 Bulletin 2005/26 (21) Application number: 03775659.0 (22) Date of filing: 29.09.2003

(51) International Patent Classification (IPC)7: H04L 12/24 (86) International application number: PCT/IB2003/005605 (87) International publication number: WO 2004/030277 (08.04.2004 Gazette 2004/15)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR Designated Extension States: AL LT LV MK (30) Priority: 30.09.2002 GB 0222549 (71) Applicant: Marconi Intellectual Property (Ringfence) Inc. Warrendale, PA 15086 (US)	(72) Inventor: BLACKMORE, Andrew Co. Dublin (IE) (74) Representative: Stasiewski, Piotr Grzegorz et al Marconi Intellectual Property,New Century Park,Post Point 51 Coventry,West Midlands CV3 1HJ Coventry,West Midlands CV3 1HJ (GB)